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Tri-clamp instrument head: ISO 2852 cap with Ø6, Ø3 and Ø4 probe ports, 1.5, 2 and 3 in
How do I put a temperature probe through a tri-clamp end cap? · Hardware · basis: ISO 2852 cap face with three ported bosses on the C2 − 16 circle, each with an M3 pinch hole (Ø2.5)
Long Earth Society build part. The displacers and heads the LES tri-clamp engines are built from. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 3 in table
Notes
- An ISO 2852 end cap with three probe ports, so a cylinder can be instrumented without drilling a flat cap.
- Ports: Ø6 (a DS18B20 sleeve), Ø3 (a K-type sheath) and Ø4 (a 4 mm tube), 120° apart on a circle of radius C2/2 − 8 (13.75 / 20.25 / 33.75 mm for 1.5 / 2 / 3 in).
- Each port has a boss 6 mm larger than its bore, 10 mm tall on the back of the 6 mm cap, and an Ø2.5 radial hole at 11 mm for an M3 pinch screw that holds the probe.
Sizes
| size_in | flange_od_mm | port_circle_r_mm | ports_mm | pinch |
|---|---|---|---|---|
| 1.5 | 50.5 | 13.75 | Ø6 / Ø3 / Ø4 | M3 (Ø2.5) |
| 2 | 64.0 | 20.25 | Ø6 / Ø3 / Ø4 | M3 (Ø2.5) |
| 3 | 91.0 | 33.75 | Ø6 / Ø3 / Ø4 | M3 (Ø2.5) |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| head faces | ISO 2852 | ferrule face + Type B gasket | clamp | head-* |
| probe / port bores | Ø6 / Ø3 / Ø4 | DS18B20 sleeve / K-type sheath / 4 mm tube (M3 pinch) | slide | head-instrument-* |
| pinch screw holes | Ø2.5 | M3 tap drill | designed | head-instrument-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Long Earth Society | Tri-clamp Stirling engine builds | web, video | LES site |
| James R. Senft | An Introduction to Low Temperature Differential Stirling Engines (displacer and gap design) | book | Moriya Press verify |
| Wikipedia | Stirling engine | web | CC BY-SA 4.0 (text) |
Free files
★ Free files 3 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| head-instrument-1.5in | 1.5 in ISO 2852 cap: Ø6 bore for a DS18B20 sleeve, Ø3 for a K-type sheath, Ø4 port for a 4 mm tube, each with an M3 pinch screw (Ø2.5 tap drill) | STEP · STL |
| head-instrument-2in | 2 in ISO 2852 cap: Ø6 bore for a DS18B20 sleeve, Ø3 for a K-type sheath, Ø4 port for a 4 mm tube, each with an M3 pinch screw (Ø2.5 tap drill) | STEP · STL |
| head-instrument-3in | 3 in ISO 2852 cap: Ø6 bore for a DS18B20 sleeve, Ø3 for a K-type sheath, Ø4 port for a 4 mm tube, each with an M3 pinch screw (Ø2.5 tap drill) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-instrument-head
How it fits
Goes in or on
Tri-clamp spool, 1.5 and 2 inchISO 2852 face on any ferrule of its sizeConnects to
Split probe clamps for Ø3, Ø4.8, Ø6 probes and Ø8…DS18B20 sleeve Ø6, K-type sheath Ø3
Silicone tube 1 × 3 to 10 × 14 mm4 mm tube in the Ø4 portAlso needed
Tri-clamp clamp, two-boltclamp and gasket on the faceYou might also need
Questions
What probes fit the instrument head?
A Ø6 DS18B20 sleeve, a Ø3 K-type sheath and a 4 mm tube, each in its own bore with an M3 pinch screw.
Where are the ports?
120° apart on a 20.25 mm radius on the 2 in head (13.75 on 1.5 in, 33.75 on 3 in).